lucaswe

I solved it by myself by using the code below:
note: the code below shows both the page content and the posts with the right category ID in the same page.

<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<div class="post">
<h2><?php the_title(); ?></h2>
<div class="entry">
<?php the_content('Read the rest of this entry &raquo;'); ?>
<?php wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
</div></div>
<?php endwhile; ?>
<?php else : ?>
<h2>Not Found</h2>
<p>Sorry, but you are looking for something that isn't here.</p>
<?php endif; ?>
<?php query_posts('cat=5'); ?>
<div class="archive">
<ul>
<?php while (have_posts()) : the_post(); ?>
<li>
<h3><a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><span class="archive-date"><?php the_time('M d Y') ?></span><?php the_title(); ?></a></h3>
</li>
<?php endwhile;?>
</ul></div>